Color postcard from 1929 showing a view of the St. Marys River with the International Railroad Bridge, built in 1887, in the background near Sault Sainte Marie, Ontario. This postcard is part of the "Souvenir of Sault Ste. Marie, Canada" souvenir...

Color postcard from 1928 showing the freighter "Fitzgerald" locking down after a 72 hour December storm on Lake Superior, in Sault Sainte Marie, Michigan. The postcard is part of a Sault Sainte Marie souvenir postcard booklet. The Soo Locks,...

Color postcard from 1928 of a whaleback cargo ship leaving the Canadian Soo Lock in Sault Sainte Marie, Ontario. The postcard is part of a Sault Sainte Marie souvenir postcard booklet. The Soo Locks, located on St. Marys River between the United...

Color postcard booklet cover from a 1928 Sault Sainte Marie souvenir postcard booklet, featuring an image of the Soo Locks. The locks, located on St. Marys River between the United States and Canada, provide ships safe passage around the rapids in...

Color postcard from circa 1907-1915 of a view of ships moving through the Soo Locks from the power house in Sault Sainte Marie, Michigan. The Soo Locks, located on St. Marys River between the United States and Canada, provide ships safe passage...

Color postcard from circa 1935-1945 of a passenger ship leaving the Poe Lock, part of the Soo Locks in Sault Sainte Marie, Michigan. The Soo Locks, located on St. Marys River between the United States and Canada, provide ships safe passage around...

Color postcard from 1920 of a freighter entering the Soo Locks in Sault Sainte Marie, Michigan.The postcard is part of the "Souvenir of the Tourist Playground of Cloverland, Soo, Mich." souvenir postcard booklet. The Soo Locks, located on St. Marys...

Color postcard from 1920 of freight ships below the Soo Locks in Sault Sainte Marie, Michigan. The postcard is part of the "Souvenir of the Tourist Playground of Cloverland, Soo, Mich." souvenir postcard booklet. The Soo Locks, located on St. Marys...

Color postcard from 1920 of a ship moving through on of the Soo Locks, with more waiting in the background, in Sault Sainte Marie, Michigan.The postcard is part of the "Souvenir of the Tourist Playground of Cloverland, Soo, Mich." souvenir postcard...

Color postcard from 1920 of boats being lowered in the Poe Lock, part of the Soo Locks in Sault Sainte Marie, Michigan. The postcard is part of the "Souvenir of the Touris Playground of Cloverland, Soo, Mich." souvenir postcard booklet. The Soo...

Map from 1761 intended to illustrate fur trading between Michigan settlements and Canada, showing the eastern section of the Upper Peninsula, including the Straits of Mackinac, St. Marys River and portions of Ontario.

Color postcard from 1920 showing a view of the Soo Locks from the eastern approach in Sault Sainte Marie, Michigan.The postcard is part of the "Souvenir of the Tourist Playground of Cloverland, Soo, Mich." souvenir postcard booklet. The Soo Locks,...

Color postcard from 1920 showing several large lake freighters, most likely carrying ore and grain, awaiting their turns in the Soo Locks in Sault Sainte Marie, Michigan.The postcard is part of the "Souvenir of the Tourist Playground of Cloverland,...

Color postcard from 1920 of a passenger steamer in the Weitzel Lock of the Soo Locks, Sault Sainte Marie, Michigan.The postcard is part of the "Souvenir of the Tourist Playground of Cloverland, Soo, Mich." souvenir postcard booklet. The Soo Locks,...